[Feature] Support for importing from other applications

[lothkang]

Currently, I'm using Authenticator Pro on Android and I was looking for a 2FA app for Windows as well. I have a large number of accounts with 2FA enabled and I can't find a way to import those entries from Authernticator Pro into 2Fast. This feature would make it easier for users to migrate from exisiting authenticators on their phones to 2Fast on Widnows.